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Business Segment (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | $ 2,083,846 |  | $ 2,083,846 |  | $ 1,886,241
External revenues | 3,005,762 | $ 3,467,986 | 5,496,024 | $ 6,388,750 |
Income (Loss) | 46,310 | 24,820 | 132,184 | 48,337 |
Net income | 46,310 | 26,191 | 132,184 | 49,123 |
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 2,083,846 |  | 2,083,846 |  |
External revenues | 3,005,762 | 3,467,986 | 5,496,024 | 6,388,750 |
Income (Loss) | 46,310 | 24,820 | 132,184 | 48,337 |
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 0 |  | 0 |  |
External revenues | 0 | 0 | 0 | 0 |
Income (Loss) | 0 | 1,371 | 0 | 786 |
Operating Segments | Marketing | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 1,791,859 |  | 1,791,859 |  |
External revenues | 3,005,750 | 3,467,985 | 5,495,808 | 6,388,489 |
Income (Loss) | 53,442 | 33,468 | 145,867 | 58,223 |
Corporate, Non-Segment | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | 291,987 |  | 291,987 |  |
External revenues | 12 | 1 | 216 | 261 |
Income (Loss) | $ (7,132) | $ (8,648) | $ (13,683) | $ (9,886) |

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